This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A035258 #21 Jul 30 2020 12:22:24 %S A035258 1,2,4,8,9,13,16,17,18,19,25,26,32,34,36,38,43,47,49,50,52,53,59,64, %T A035258 67,68,72,76,81,83,86,89,94,98,100,101,103,104,106,117,118,121,127, %U A035258 128,134,136,137,144,149,151,152,153,157,162,166,169,171,172,178 %N A035258 Positive integers of the form 2x^2+xy-2y^2 (discriminant 17). %C A035258 Also, indices of the nonzero terms in expansion of Dirichlet series Product_p (1-(Kronecker(m,p)+1)*p^(-s)+Kronecker(m,p)*p^(-2s))^(-1) for m= 17. %H A035258 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references) %o A035258 (PARI) m=17; select(x -> x, direuler(p=2,101,1/(1-(kronecker(m,p)*(X-X^2))-X)), 1) \\ Fixed by _Andrey Zabolotskiy_, Jul 30 2020 %Y A035258 Primes: A038889. %Y A035258 Cf. A035199. %K A035258 nonn %O A035258 1,2 %A A035258 _N. J. A. Sloane_ %E A035258 Entry revised by _N. J. A. Sloane_, Jun 01 2014 %E A035258 More terms from _Colin Barker_, Jun 17 2014